Presentation on theme: "What makes water so special?"— Presentation transcript:

4 Water is Polar!!!! The oxygen end “acts” negativeThe hydrogen end “acts” positiveCauses the water to be POLAR, like a magnet.

5 Hydrogen Bonds Exist Between Water MoleculesFormed between a highly Electronegative atom (like oxygen in another water) of a polar molecule and a hydrogenWeak bond, but strong in great numbers (ask about Crocodile Dundee)

6 Interaction Between Water MoleculesNegative Oxygen end of one water molecule is attracted to the Positive Hydrogen end of another water molecule to form a HYDROGEN BOND

11 Properties of Water Cohesion Adhesion High Specific HeatHigh Heat of Vaporization1

12 Properties of Water Cohesion Adhesion High Specific HeatHigh Heat of VaporizationLess Dense as a Solid1

13 CohesionAttraction between particles of the same substance ( why water is attracted to itself)Results in surface tension (a measure of the strength of water’s surface)1

14 Helps insects walk across water, but how is it helpful to people?Cohesion …Helps insects walk across water, but how is it helpful to people?

15 Adhesion Attraction between two different substances.Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton.Capillary action-water molecules will “tow” each other along when in a thin glass tube.1

17 High Specific HeatAmount of heat needed to raise or lower 1g of a substance 1° C.Water resists temperature change, both for heating and cooling.Would you rather walk on sand or in water on a beach on a hot summer day?Which would be warmer that night? Why?1

19 Heat radiated from the sun warmed surface of the earth is Water vapor forms a kind of global ‘‘blanket” which helps to keep the Earth warm.Heat radiated from the sun warmed surface of the earth isabsorbed and heldby the vapor.1

32 Quick Quiz Draw a water molecule with labeled atoms and charges.What is the property called that describes water sticking to itself?What makes a solution acidic?What has a higher pH, bleach or lemon juice?Why do we sweat?

34 Quick Quiz Draw a water molecule with labeled atoms and charges.What is the property called that describes water sticking to itself?

35 Quick Quiz Draw a water molecule with labeled atoms and charges.What is the property called that describes water sticking to itself?What makes a solution acidic?

36 Quick Quiz Draw a water molecule with labeled atoms and charges.What is the property called that describes water sticking to itself?What makes a solution acidic?What has a higher pH, bleach or lemon juice?

37 Quick Quiz Draw a water molecule with labeled atoms and charges.What is the property called that describes water sticking to itself?What makes a solution acidic?What has a higher pH, bleach or lemon juice?Why do we sweat?